This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions A practical approach to borderline melanocytic neoplasms CAP TODAY Treatment of Melanoma Metastasis: Surgical, Chemotherapy, and Innovation Generalized Melanosis in Metastatic Malignant Melanoma: The Possible Role of DOPAquinone Metabolites Semantic Scholar Tumoral Melanosis New England Journal of Medicine